preload: Fix pointer-to-enum cast

clang 11 raised a `-Werror=void-pointer-to-enum-cast` on this. Cast
the pointer twice to avoid this, like glib's `GPOINTER_TO_INT` does.

Run dnf tests with clang to reproduce this.

Fixes #116

Author: martinpitt

src/libumockdev-preload.c

@@ -922,7 +922,7 @@ script_record_open(int fd)
     assert(r);
     r = fd_map_get(&script_dev_format_map, fd_dev, &data);
     assert(r);
-    fmt = (enum script_record_format) data;
+    fmt = (enum script_record_format) (long) data;
 
     DBG(DBG_SCRIPT, "script_record_open: start recording fd %i on device %i:%i into %s (format %i)\n",
 	fd, major(fd_dev), minor(fd_dev), logname, fmt);

tests/run-dnf

@@ -27,7 +27,7 @@ else
 fi
 
 # install build dependencies
-dnf -y \${repos:-} install meson git gcc glib2-devel gtk-doc libgudev1-devel libtool libudev-devel make python3 python3-gobject-base usbutils vala xz systemd-udev valgrind \$packages
+dnf -y \${repos:-} install meson git gcc clang glib2-devel gtk-doc libgudev1-devel libtool libudev-devel make python3 python3-gobject-base usbutils vala xz systemd-udev valgrind \$packages
 
 # run build as user
 useradd guest
@@ -43,6 +43,11 @@ if [ "\$coverage" = true ]; then
     meson test -v --num-processes=1 --setup valgrind --no-suite fails-valgrind
     cat meson-logs/coverage.txt
 fi
+
+# build with clang
+cd /source
+CC=clang meson setup /tmp/clang -Dgtk_doc=false
+meson test -C /tmp/clang -v --num-processes=1
 EOG
 
 EOF